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概要

Insulation degradation of cable insulation causes fire due to electric leakage. Cable insulating materials laid in nuclear power plants deteriorate over time, heat and influence of radiation. Here we investigated the degradation tendency of insulating materials by radiation irradiation by hammering inspection using AE sensor. As a result, for any cable insulation material, curing of insulating material with irradiation could be detected as a change in natural frequency. From here, the applicability of AE hammering test as a sound inspecting method for cable insulation was confirmed.

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